5.2.5 狼来了
05-狼来了 — Comprehensive Rust
译文 · 基于 Comprehensive Rust
原文链接: https://google.github.io/comprehensive-rust/unsafe-deep-dive/rules-of-the-game/copying-memory/crying-wolf.html
5.2.5 狼来了
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| // Copyright 2026 Google LLC
// SPDX-License-Identifier: Apache-2.0
pub unsafe fn copy(dest: &mut [u8], source: &[u8]) {
for (dest, src) in dest.iter_mut().zip(source) {
*dest = *src;
}
}
fn main() {
let a = &[114, 117, 115, 116];
let b = &mut [82, 85, 83, 84];
println!("{}", String::from_utf8_lossy(b));
unsafe { copy(b, a) };
println!("{}", String::from_utf8_lossy(b));
}
|
「也可以创建所谓的『狼来了』函数。
「这类函数被标记为 unsafe，但程序员无需检查任何安全前置条件。